/usr/lib/x86_64-linux-gnu/wine/libdxgi.def is in libwine-dev 1.8.7-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 | ; File generated automatically from ./dlls/dxgi/dxgi.spec; do not edit!
LIBRARY dxgi.dll
EXPORTS
CreateDXGIFactory @1
CreateDXGIFactory1 @2
DXGID3D10CreateDevice @3
DXGID3D10RegisterLayers @4
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